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Combine columns into rows with MySQL?
To combine columns into rows, use UNION ALL. Following is the syntax −
Syntax
select yourColumnName1 from yourTableName union all select yourColumnName2 from yourTableName;
Let us first create a table −
mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int -> ); Query OK, 0 rows affected (0.88 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(100,200); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(500,600); Query OK, 1 row affected (0.18 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+--------+--------+ | Value1 | Value2 | +--------+--------+ | 100 | 200 | | 500 | 600 | +--------+--------+ 2 rows in set (0.00 sec)
Here is the query to combine columns into rows −
mysql> select Value1 from DemoTable -> union all -> select Value2 from DemoTable;
This will produce the following output −
+--------+ | Value1 | +--------+ | 100 | | 500 | | 200 | | 600 | +--------+ 4 rows in set (0.00 sec)
Updated on: 12-Dec-2019
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